Abstract
Hydrogenated fullerene-like carbon (H-FLC) film is of great potential in reaching macro-scale ultra-low friction. But its friction regime is still under debate. In this study, friction behavior of H-FLC was investigated in vacuum and ambient under various rotational speeds. Results show that friction coefficient is in negative correlation with rotational speed. At rotational speed of 500 rpm, H-FLC film reached ultra-low friction (0.015). Detailed nano-structure evolution research indicates that the odd carbon ring fraction at sliding interface is the origin of H-FLC's low friction. Namely, randomly oriented pentagonal and heptagonal carbon rings were rearranged in wear track, which enhanced the FL content. This work corroborated that rehybridization at frictional interface of H-FLC plays an important role in its ultra-low friction.
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